It almost sounds like the bolt release mechanism was pushed in; this keeps the bolt from closing - ie, 'stuck'. The only other reason a bolt would be 'stuck' is from a jam (spent shell casing that didn't properly eject [failure to eject = FTE], or the next round did not feed properly [failure to feed = FTF])
Note, the bolt should automatically be held open when the last round in the magazine is fired. This is called 'Bolt Hold Open'. When this occurs, you do not need to use the charging handle to load the next round (although you can), but rather, depress the bolt release (left hand side of firearm) once the new magazine has been inserted.
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